Pneumatic clutches



Dec. 18, 1956 Original Filed Nov. 23, 1948 J. H. WlLSON PNEUMATIC CLUTCHES 10 Sheets-Sheet 1 I N VEN TOR. /bfia 15 4:2212 W750i] Des. 18, 1956 .1. H. WILSON 2,774,453

PNEUMATIC CLUTCHES Original Filed Nov. 23, 1948 10 Sheets-Sheet 2 INVENTOR.

Dec, 18, 1956 J. H. WILSON PNEUMATIC CLUTCHES Original Filed Nov'. 23, 1948 10 Sheets-Sheet 3 INVENTOR.

Dec. 13, 3955 wlLSON 2,774,453

PNEUMATIC CLUTCHES Original Filed Nov. 23, 1948 1O Sheets-Sheet 4 INVENTOR. 7 b: Ham WEI 5471.7

Dec. 18, 1956 J. H. WILSON 2,774,453

PNEUMATIC CLUTCHES Original Filed Nov. 23, 1948 10 Sheets-Sheet 5 IN V EN TOR.

Dec, 18, 1956 J. H. WILSON 2,774,453

PNEUMATIC CLUTCHES Original Filed Nov. 23, 1948 10 Sheets-Sheet 6 IN V EN TOR.

2' l4 His qqqni Dec. 18, 1956 J, WILSON 2,774,453

PNEUMATIC CLUTCHES Original Filed Nov. 23, 1948 10 Sheets-Sheet '7 VIII/l7 5/ 6' a 50 2 l 50 INVENTOR.

J521512 H011? M75012 ec, 18, 1956 J. H. WILSON 2,774,453

w zwii' 1956 J. H. WILSON PNEUMATIC CLUTCHES l0 Sheets-Sheet 9 Original Filed Nov. 23, 1948 I I INVENTOR.

.ziaflfMYsmz Dec. 18, 1956 J. H. WILSON 2,774,453

PNEUMATIC CLUTCHES Original Filed Nov. 25, 1948 10 Sheets-Sheet 1o T515 a Z; 5 3- 3 V 1 s 95 f M 7 86 If 1/ I United States Patent PNEUMATIC CLUTCHES John Hart Wilson, Wichita Falls, Tex.

Continuation of application Serial No. 61,565, November 23, 1948. This application December 8, 1954, Serial No. 473,943

4 Claims. (Cl. 192-88) This invention relates to improvements in Pneumatic Clutches of the character adapted particularly for use on the drums of well drilling rigs and other heavy machinery, for connecting a source of power with a driven member.

Well drilling rigs include a winding drum that is adapted to be driven at difierent speeds under difierent conditions for winding a cable thereon. It has been customary heretofore to provide separate high speed and low speed positive clutches connected with the drum shaft at the respective opposite ends of the winding drum for selectively transmitting power thereto through the drum shaft. Since the winding drum must be operated frequently at relatively high speeds or under heavy load conditions, these clutches are subjected to severe wear.

An object of this invention is to improve the construction of clutches adapted for this purpose, to enable the power to be transmitted directly to the driven member even under high speed or heavy load conditions without an appreciable generation of heat between the operating parts, and with a dissipation of such heat as is generated therein.

A further object of the invention is to provide for the operation of clutches through pneumatic means, utilizing a pneumatic power device connected directly in the clutch itself, for the application of pressure thereby to the clutching surfaces, so as to insure of a proper actuating connection therebetween without requiring mechanical connections with the clutch, such as have been necessary heretofore in mechanically operated clutches.

Another object of the invention is to provide for transmitting two speeds to a drum through fluid actuated clutches contained within the drum and the brake ring assembly thereof, the clutches serving to transmit the power directly to the drum Without imposing a torsional strain on the supporting shaft thereof.

Still another object of the invention is to improve the construction of such pneumatically actuated clutches to enable these to apply clutch engagement efliciently between the coacting surfaces and to be effective for the purpose under all operating conditions that may be encountered in the use of the clutch.

Another object of this invention is to provide a hoisting drum with water cooled brake rings in which two friction clutches are located, one inside each of the brake rings to provide two speeds to the drum, without transmitting the power through the drum shaft, thus to form a more compact, light weight and more readily transportable unit.

A further object of the invention is to provide a hoisting drum with dual friction clutches of the fluid actuated type, in which the actuating fluid is conducted by conduits intermediate the respective clutch and drum end, and thence through a passage formed in the respective clutch driving rings and thence to the respective-fluid actuated elements located at that side of the respective clutch friction elements remote from the drum.

The application of even power to the clutch is especially important where the clutch is operating under high.

Ice

speed, when deflection of the operating member by centrifugal force tends to interfere with clutch actuation.

These objects may be accomplished, according to one embodiment of the invention, by the use of a pneumatic, yieldable and flexible power member arranged to apply force between the coacting surfaces of the clutch, and preferably bonded to a plate to prevent distortion by centrifugal force, and a suitable connection with a source of fluid under pressure. The pneumatic device is con tained in the clutch as a part of the structure thereof, and provision is made for supplying power thereto through the power shaft or axle of the body being rotated, so as not to require external mechanical connections, as has been necessary heretofore with mechanical clutches.

In this embodiment of the clutch it is preferred to,

utilize a pneumatically expansible tube mounted in the clutch for the application of pressure against the coacting surfaces. The tube is so constructed and assembled in the clutch as not to be distorted by centrifugal force as applied'thereto by rapid rotation thereof. It

is also constructed to withstand the heavy pressures towhich it may be subjected and is securely mounted for expansive action under operating conditions. This pneumatic tube acts against coacting surfaces so constructed and arranged as to dissipate heat resulting from the clutch engagement, the coacting surfaces being insulated from the pneumatic tube, provision being made for circulation of air to increase the effectiveness of the insulation.

Provision is made also to facilitate access to the op-.

erating parts of the clutch, for assembly, repair and replacement as desired. It is a feature of the invention that the fluid actuated expansible tube is disposed at that side of the clutch remote from the drum, whereby the tube is readily accessible for maintenance purposes.

A further object of the invention is the provision in a hoisting drum having a brake ring at one or both ends thereof and a clutch within the brake ring, of fluid actuated means located at that side of the clutch remote from the drum for engaging the clutch, a water jacket within the brake ring for cooling the latter, and means for circulating water through the jacket.

The invention is illustrated more particularly in the accompanying drawings, in which:

Fig. 1 is a side elevation of a well drilling rig, showing one embodiment of the invention applied to the drum thereof;

Fig. 2 is a longitudinal sectional view through a portion of the shaft structure of the drum thereof, with parts omitted for clearness of illustration;

Fig. 3 is a similar view through one of the clutches adapted for operation at high speed;

Fig. 4 is a view similar to Fig. 3, on an enlarged scale of a'portion of the high speed clutch;

Fig. 5 is a view similar to Fig. 3, showing a low speed clutch having multiple clutch plates;

Fig. 6 is a similar view on enlarged scale, showing a modification of the clutch;

Fig. 7 is a side elevation of an annular air tube, detached;

Fig. 8 is a side elevation of a split air tube removed from the clutch;

Fig. 9 is a transverse section thereof on the line 99 in Fig. 8;

Fig. 10 is a cross section through the clutch;

Fig. 11 is a cross section on the line 11-11 in Fig. 5;

Fig. 12 is a detail perspective view of 'a portion of one of the clutch rings showing the spacers thereon;

Fig. 13 is a detail cross section through the clutch, on the line 1313 in Fig. 16;

Fig. 14 is a similar view on the line 14-14 in Fig. 16;

Fig. 15 is a detached perspective view of an air coupling therefor; a 7

Fig. 16isapartial endeievation of the clutch showing a-modifieationtherein; and-- Fig. 17 is an enlarged cross section through the air coupling.

The invention .isshown;- for the purpose-of illustration,

as appliedto the drum of awelldrilling rig. generally designated 'by the numeral- 1', ineluding a winding drunr 2 having flanges -3 at-oppositeends thereof, each; carrying a .brake ring- 3 thereonwith which brake bandel'ementso 3 (not shown) cooperate to retardor'stoptheimovement 'of the drum; at will.

7 The'construction and operation of thewindingdrumids well'known in the art and may be-of any desiredor usualcharacter. The winding drum 7 2-is mounted on a'shaft,4, which,shaft 4. is shown in' Figs. 3" and 5;:as journaled in bearings 5 mounted on suitable supportsoiwhichare parts of the rig 1.

The shaft 4' usually has connected therewith a brake B and other elements of. the well'drilling rig, the: details of'which are omitted for .clearness of illustration, since i these are well under'stoodinthe art. The shaft 4is .shown an the inter edge of 'a clutch plate 32. The clutch plate 32 istitt'ed-clirectly-on'the periphery'of the driving member 27, although slidableaxially relative thereto, with the teeth 30 and 31 in constant mesh so as to cause positive V rotation of the clutch plate 32 upon rotation of the driving member 27. V Mounted on the opposite sides of the driving clutch plate 32 are driven; clutch discs,,gen'erally,'designated at 1 33 and 34, respectively, in position, for frictional engage- V ment at their inner faces against the adjacent side faces in Fig.2, as connectedwith an aligned section, 4" of -the shaft through a flexible coupling, generally designated ing therethrough in alignment with the bore 1 3, as shown. inFig. 2. .The. bores 12 and,13.,are adapted to receive therfethl'ough a conduit assembly comprisin gjconduits 1.4,

and' 15fsecuredin rigidrelation to each other and adapted to .supply air underpressure to the respective speed andlow speed clutches,.as hereinafter. described. Any 7 suitable fluid may beusedforactuating the clutches and The connecting thereby controlling thecdriving of the drum. 2. These conduits 14 and 15 are adapted to be introducedv or.

removed from the bores as;a unit, and have flexible joints 16' intermediate the-length thereof inposition to allow for flexure of the coupling 7.

At the outer end of the shaft section4', the conduits 14 and 15 are connected with arotary fluid joint comprisingarotatable connector, section 18 journaled in .a head 17, section 18 rotating with the shaft 4 and coacting. with astationary head=section 19. The head section-19 communicates with tubes 20. and 21 whichextendz to. at'

suitable control valve 22; (Figs. 1 and 2).; for regulating the control of air, under pressure. to the respective conduits. V I g Y The inner ends ofth'e. conduits 14 and 15 ;are connected through conduits 23.and 23,, respectively, withthe high and. low-speed. clutch devices, @as shownmoredn; detail in Figs. 3 andS. V a r Figs; 3 and 4 show one .form of high-slled clutch for operating the drum 2 'from asuitable;v sourcefof power, connection to the drum being effected through; an annular clutch driven ring 24 which is secured by bolts 25 .10

1 one of the flanges 3-ofthedrum 2. at-the. high speed end thereof. Also secured to the flange 3 is a back-up, plate= 26.

A drum-driving member; or-spider 27is.,jol1rnaledjon*- V bearings 27 on the shaft 4, which drum-driving: mern-X ber 27 has a. sprocket-wheel; -2& mountedflhereongfor operationgbya gsprocketchain which, sprocketichairr; 28

extends ,to the source of;po werthrough; a suitable chain guard 29., The chain; guard j 29iis proyided: withra; suit-r ableoil seal 29- aroundthe; sprocket-wheel 28.; 'Imthe form shown in Fig. 3, the oilssealfis of thelabyrinthdypez.

The a driving member 27 has a series. ofgteeth fill-formed V on ;the-periphery thereofijwhichneethiare'in constant mesh with a series of coacting teeth generally inrlidatediat fili.

of thedriv ing clutchplate'32, Each of the drivenclutclr discs I33 and 34-preferablyincludes a section of. woven asbestos materia1,;indicated at 35, on the inner f ace. 7

thereof which, nevertheless, may be molded in one'unit with the body of the clutch disc 33 or 34, which body may also be of molded asbestos of sufiicient strength and rigidity to withstand the pressure required.

.- The periphery of each of the discs 33 and 34 is formed with teeth 36' that intermesh with teeth 37 on the inner surface'of the ring 24; in constant interfitting' relation,

therewith, so as'to form a secure connection betweenthe clutch discs 33 and 34.and the. driven ring 24, causing direct and positive rotation of the latter, and, therefore,

' of the drum 2", whenever the-clutch discs 33' and,34.are,

driven.

The clutch disc 33 'is-adapted" to engage the back-up .plate- 26 when pressure is applied} against :the' opposite side thereof through'theplate 32 and, the clutch disc 34.

' To provide for the application of pressurelthereto in clutch engagement, 'I have showna supporting plate 38 secured to the adjacentsidezof theiclutch. disc. 34. As shown at thebottom inFig. 3, the. supporting plate 38 is connected to circumferentially. spaced. pins 319v for 35 retracting the plate 38 .andthe' clutch discjconnected j thereto. Each of the pins, 39 is, secured to-fthe. plate 38 atone end thereof, and at its oppdsiteeridextehds through an annular'cover plate 40, which is secured to theclutchI ring 24 by the. bolts 25, hereinbe fore m entioned,'.,as" 'shownin Fig. 3. A coiled spring 41' v is sleeved overeach ofthepins 39 withiria sleevev 42fseated incover plate 40,

and bears outwardly 'against a snap ring 43 fixed to the .piny39, whereby the several circumferentially spaced springs will apply uniform yieldable. action to the plate j 38 tending to vrelease theclutch 24- by the bolts 25, hereinbefore mentioned. I

' A pressure. plate 44 is spacedlaterally from the'plate" 381and. has. interposed therebetween a seriesof ribs.45,.

eachv formed of a radially extending bar,- which: ribs. 45

' arefspacedapart circu mferentially (Fig rl2) asufficient distance, for the ready circulation of. air therebetween v Each rib 45 issecured to the plate 44 by welding at spaced points, as indicated at 46, or in any other suitable manneigi.

. and interposed'betwee'n. the edge of the rib 45 and the plate. 4,4.is .a strip 47 of heat'insulating'material,such as;

asbestos. This strip prevents anyappreciable transfer; ofheat from. the. ribito the-plate144. One or both of. the.

oppositeends ofeach rib 45-may betapered, asshowng in Fig. 12.

Securcd'to the cover-plate 40 -is a;support'p1ate1 48" enclosed at its periphery by an-jannulanshoulder 49 formed inthe cover plate 4.0.. The:plate-48;is;made. in. two. sections, in the form of; the invention illustratedini Fig. 8, and each section thereof carries ion-its inner. face asemi-circularair tube,'general ly indicated at 50.. The: air tubes 50, which are separatedjfrom; each: other, in

thislembodiment are' arranged injendfto end; relation to f Substantiall! nnular. xpansion. device, pin- 1 terposed-between the plate 48a'nd they.adjacentzfacegof; the .pr.essure-p la te;- 44, and capableyoi; expanding axially to apply; frictional;engagement; to the opposed: clutch? plates. a r

Whilfi fihQQ-iOIIHiOf' the: invention: as; described: may. 7 -use semi-circular"airytubes .50, fit: is. alsolpractical to make? acompletely: annular air: tube, as shown-ah 50 in Fig; '72 This: annular air tube 50 would be made and used in the same manner as the semi-circular air tubes 50. The annular air tube 50' is mounted onan annular support plate 48'. Connections preferably are made at opposite sides of the air tube 50'.

The air tube 50 or 50' preferably is formed of heavy duty rubber with interwoven canvas and is so made as to expand axially upon the application of pressure as described. It is substantially flat in cross section with rounded edges, as shown in Fig. 9, and preferably has thickened lateral sides, as indicated at 51 in Fig. 9, one of which is vulcanized directly to the plate 48, or otherwise bondedthereto, or to the plate 44, or both, so as to hold the air tube securely to the plate. This bonded connection between the air tube 50 and the plate 48, and the circumferential confining of the plate 48 by the shoulder 49, will prevent radial distortion of the air tube as a result of centrifugal force when the driving member of the clutch is operating at high speed, and insures of the anchoring of the air tube within the driving elements under different operating conditions thereof.

The edge portions of the air tube are shown in Fig. 9 as provided with a torus-shaped chamber 50a connected through an appreciably thinner air space 51 to reduce appreciably the quantity of air required to expand the air tube. The chamber 59a allows greater flexibility at the edges for ready expansion.

The center portion of each air tube section 50 is provided with a spud 52 secured thereto, as by vulcanizing it in place in a wall of the air tube at the center of the plate 48, as indicated at 53, Fig. 9, so as to anchor the spud securely therein and to provide for the circulation of air into the air tube when desired.

The spud 52 is connected with a coupling 54 into which a pipe section 55 is threaded, as indicated at the top in Fig. 3 and in Fig. 4. The pipe 55 extends radially in a groove 56 formed in the cover plate 40 on the front face thereof and extends outwardly toa coupling 57 to which a dump valve 58 is connected. A flexible hose 59is connected with the dump valve 58 and extends to a T 60 at the outer end of the pipe 23, see Figs. 3'and 4. A similar connection 54-59 is provided for each section or each diametrically opposite portion of the air tube 50, the respective hoses 59 being connected to opposite sides of the T 60, the arrangement being similar to that shown at 72 in Fig. 11 with respect to the low speed clutch, yet to be described.

Each hose 59 is so mounted in the flange structure of the drum that it will flex and have a tendency to project outwardly when released from its connections 5758. Thus access may be had to these parts for disconnection or repairupon removal of the chain guard 29. The pipe 55 and coupling 57 are secured in exposed positions to which a workman can gain access readily for removal of these parts. Upon disconnection of the coupling 57, the dump valve 58 will be projected forwardly into an exposed position by the flexing of the hose 59, enabling the workman to gain access thereto, as may be required.

Provision is made for the circulation of air through the spaces between the ribs 45 and outward through peripheral openings 61 in the ring 24 for a cooling effect on the clutch members. Additional peripheral openings 62 are provided in the ring for the circulation of air outwardly from the region of the clutch plate.

The operation of this form of clutch will be evident from the foregoing description. The valve 22 is actuated to connect the source of air supply with the pipe 21, communicating through the pipe 14-with the pipe 23, thence through the hose 59 to the respective dump valves 58, couplings 57, pipes 56 and couplings 54 to the respective opposite sides of the air tube 50.

As air is admitted to the air tube 50 or the sections thereof, this tube will be expanded axially in an inward direction, since it is confined on its outer side by the plates 40 and 48, and will press inward against the plate 44, acting through the ribs 45, plate 38 and friction disc 34, to press the driving plate 32 against the friction plate 33, axial displacement of the latter being resisted by the back-up plate 26. a

The discs 33, 34 and 32 are permitted to move axially in response to such pressure by the toothed connections 30, 31, with the spider 27, and by the, toothed connections 36 and 37 of the discs 33 and 34 with the surrounding ring 24. These toothed connections maintain the driving relation with the driving and driven parts while permitting the plates to move axially in response to such axial pressure by the air tube 50.

As air under pressure is admitted to the air tube 50, the clutch plates 3244 will be moved into frictional engagement causing the plate 32, which rotates with the spider 27, to transmit movement to the driven clutch discs 33 and 34, which, in turn, transmit motion to the inter-connected drum driving ring 24 which is attached to the flange 3 of the drum 2. In this way the driving force will be transmitted from the sprocket wheel 28 and the spider 27 to the drum 2 to cause rotation thereof at the driving speed.

The low speed clutch is applied to the opposite end wall or flange 3 of the drum 2, as shown in Fig. 5. The construction and operation of the low speed clutch are similar to the high speed clutch described above, except as hereinafter noted.

The low speed clutch has a driving sprocket 63 appreciably enlarged in diameter with respect to the driving sprocket 28 of the high speed clutch, as will be evident by comparing Figs. 3 and 5. The sprocket 63 is connected with a spider 64 which, in turn, is connected to two driving clutch plates 65, as compared with the single clutch plate 32 in the high speed clutch. The driving clutch plates 65 are connected with the spider 64 through interconnected teeth 65' similar in effect to the teeth 30-31, as described above.

Likewise molded asbestos driven clutch discs 66 are interposed between the driving clutch plates 65 and also between the latter and a back-up plate 67, secured to the end flange of the drum 2. An opposite clutch disc 68 is on the outer pressure side of the clutch plate 65, which clutch discs 66, 68 have toothed connections 66' with the drum driving ring 69 which is attached to the end flange of the drum 2.

The air tube is shown at 70, constructed of one annular section or of two sections as described above and shown in detail inFigs. 7 to 9. The air tube 70 is supplied with air under pressure through the flexible hose 71 which are connected with a T 72, and which, in turn, is connected with the supply pipe 23, as described above. The connections from the air tube 70 to the hose 71 and with the T 72, are substantially identical with the corresponding parts described in connection with Figs. 3 and 4.

When valve 22 (Fig. 1)' is suitably actuated, air under pressure flows through pipes 20 and 15, conduit 23', and hose 71 to the air tube 70, expanding the latter away from the back-up plate 70 in an axial direction toward the right in Fig. 5. This expanding action will press the clutch disc 68 into frictional pressure relation against the first driving clutch plate 65, which movement will be transmitted through the interposed clutch discs 66 to the second clutch plate 65, and through this, in turn, to the clutch disc 66 at the right against the back-up plate 67, thereby firmly pressing the several clutch plates into clutching engagement with each other, and connecting the spider 64 in driving relation with the drum drive ring 69 on the drum 2. These parts will be restored to their released and disconnected positions upon closure of valve 22 and release of pressure through the dump valve.

The structure provides a simple and efiective clutch mechanism for driving the drum 2 either in high or low speed, and without the mechanical connections heretofore required in such clutches. The parts are assembled so as to be readily available for assembly, for replacement, or for repair. i

in the modification shown in- Fig; :6, the; construction generally is 'simi-la'r to that shown' -in Fig. 5, andg-i s operated in substantially the same ma-nn'e'r as described abo've.

In -this form, howev'erfthe multiple clutch plates here cle's'ignatedjas'75, 'a'r e separated from the frictional clutch disc's"76"by 'a series of circumferenti'a'lly spacedcompression "springs '7 7='nioi1nted between the facing clutch discs=76 on opposite sides'of each'elutch plate 75. These springs serve to spread apart these clutch plates evenly sothat the intermediate :clutchiplate's 'floatfreely therebetween when the clutch is'in'operativ'e.

mostof said fric tio n discs-and said plate for actuating'said friction discs, said outermost friction discs andsaid plate I being non-rotatablerelative to said axially expansible tube 7 member, meanscondu'cting a pressure fluid-tothe i'nner "axialside of said drum'flang'e recess, and'meansincluding a flexible conduit for conducting said pressurefluid from said mean's-totheouter axial face of said axially expansible 7 tube member.

' provided with a-brake ring, said brakeringbeing provided f -A fur-thermodification is showninFig. .6, in the oil seal provided for the 'chain'figuard 79 around the driving ply pipe is'connected with the air-tube 50 throught-he driven ring 86. Thering 86- is secured to the flange 3 by bolts 87 that confine the parts of theassembly together and are spaced circumferentially'therearound, as shown in Fig. 16. V

The'ring 86 has-transverse *lioles' 88 therethrough on different sides of the center thereofiV-each hole being connected at one end with a-tube; 89 extending to 'a fitting 99 connected with" one ofthe 'air' supplypipes; At

the opposite end of the hole 88 is secured a fitting 91 secured in sealedrelation tothe ring 86-by a sealing-ring O. A tube 92 is connected with the fitting '91 and--leads to a dump valve or quickrelease'valve 92 opening into one side-or section of the air tube 50, for supplying air thereto or'releasingair therefrom.

'This'construction materially simplifies the transmission of the air supplyto'the' outer side of the clutch, insuring of its connection without undue complexity.

While the invention has been described as using two driving clutch plates interposed" between drivenclutch plates, in the low speed clutch, it is evidentthat the'nurnber of clutch plates may be yariedin eitherclutch as a desired, using fewer or'more plates. g I

The brake ring-S' -isshown as 'provided withthe'usual water 'jacket95, jtOl which cooling water is supplied through the usual water-pipes 96, 96 connected witha bore 97 in the shaft 4. r v

It will 'be' appreciated that, by supplying fluid under pressure through the drivenclutch ringfromtheinner to the outer sideof the clutch, the expansible tube may be loca'tedin an accessible position, remote from the drum. "At the same time, this arrangement permits the cooling of the'brake ring by circulating water through a jacket, with its attendant advantages.- V a I {While the-invention has been illustrated and described in certain embodiments thereof, it] is recognized that variations and changes may -be made thereinwithout departin'g therefrom, except as specified-in the claims;

This application'is a continuation of my copending ap- I plication Serial No; 6-1 ,565, filedNovember 23, 1948, now

abandoned.

:Havingtiius described-the :invention, what is clairned as new and desired to besecuredrby Letters Patent is:

1. In a-fluidipressu're actuated clutchassembly forum in a recess formed-in a dr u'mfla'nge, a rotarydrive-memher, a rotary driven member, coa'cting:frictiondiscs-interposed betweensaid-driveand driven members, certain of said friction discs :b'eing engageable with-said drivememb'eran'dcertain-of saidafriction discs being 'engageable with saiddriven'memb'e'r, said :dis'cs being axially movable 7 within said recess,-: an attachable :plate mounted on the outer end of saidorecessed drum fiau'ge,; -an axially ex-V I pansible tube member disposed intermediate the outer- :2. A power driven hoisting drum mounted ,ona -shaft,

for rotation therewith, atleaston'e end-ofsaid drumbeing with a system, including a fluid actuated clutch, clutch friction elements located within said brake ring,-a fluid actuated element for "engaging said clutch friction-elements in said'brake ring, said fluid actuated element being located at that side of the clutchfriction -element remotelfro'm said drum, a drive ring memb ersurrounding 'said clutch friction; elements and being connected in driving relationiwith at least part of saidrfriction elements, means seeuringsaid-driving ring member to said drum ends,;-a rotary fluid-joint on said drum shaft, aifluidpassageformed within said driving ring'member, the inner end 'of said fluid passage being :connected by conduit means to said rotary fluidjoint, the outer end of said fluid passage being connected by conduit means to said fluid actuated element, and 'a holdingplate rotatable with i and detachably sceured to-"the outer side of said fluid actuated element, said fiuid actuated element being re movable upon the removal'of said holding plate from said driving ring member. I r a 3. A -power driven hoisting drum mounted-on fa shaft 7 for rotation therewith, {each end of'said drum bein'g'providedwith 'aE brake ri-ng, each of said brakeringsbeing provided-with a system including a jacket within said brake ring '-for circulating waterc-therethrough, a *flui'd actuated clutch, clutchfriction Z elements located within each'of said brake rings, a 'fluid actuated element forenga'gi'ng'said clutch friction elements in each of said brake r ing's, said fluid actuated elements being loacted at that side'ef the respectiveclutchfrictionelement remote from said'drum,-a'driving ring= members'urroundin'g the clutch V friction el'ement's and connected. in Idriving relation with r at-le'a'st part of the friction'elements,"means 'secuiingsaid driving ring'members 'to said respective drum ends, a rotary fluid joint onsaid drum shaft, a fluid pas'sag'e formed within each of said 'driv'ing-ring membersythe inne'rend of 'eachof said fluid passages being-connected by conduit means-to said rotary fluid joint, the other-end of each of said fluid' passages in said' driving' ring members being connected byconduitmeans to the respective fluid actuated elements, a holding plate rotatable with and detachably secured to the outer side of'eaeh of said driving'ring m'embers and exteriorly of said' fluid'actuatejd elements, each or said fluid actuated elements" being re movable uponthe removal of the respectiveholding plates from said respective driving members,

" L- A power drivenhoisting drum mounted on a shaft for-rotation therewith, each end of said drum' being-providedwith a brakering,-ea'ch of saidbrake rings being provided with a system,- including 'afjacket ;within s'aid brake ring, fcr circula'tingcooling'water therethrough,a fluid actuated clutch, clutch friction: elements located within eachfof "said brake rings, a fluid actuated-element .7 for'engaging saidclut'ch' friction elements ineaeh; of said .7

brakef 'ringsfsaid fluidf actuated; elements being located at "that side of the respective clutch, friction elements remote fr'o'rn said drum, a holdingplate rotatable with and detachablysecured to the outer sidefof eaeh of -said brake ringsand-eXteriGrly bf said fluid actuated elements, each of s'aidffluid actuated'elements being removableupon the""removal.of the respectiveholding' platesf from 'said brakef'rings, a rotary ifi'JldjjOlDtCODIlECtEd to one endof r 7 said drum shaft, a p'airof fluid conduitswithin said shaft communieatingwifla said rotatingfluid couplingfeach of said conduits conveying'fluid tb'a point withinone ofsaid 9 10 brake rings and adjacent said drum, a clutch driven ring References Cited in the file of this patent seem-ed each of said brake rings, each of said clutch UNITED STATES PATENTS dnven nngs having a passage formed therethrough, and means including said passages connecting each of said 2395239 Whlte et 1946 conduits with one of the associated fluid actuating ele- 5 2622714 Cardweu 1952 ments. 

